斯威夫特UIWebView的限制全屏

Question

我有這些約束我的UIWebView：

let horizontalConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterX, multiplier: 1, constant: 0) 
     view.addConstraint(horizontalConstraint) 

     let verticalConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0) 
     view.addConstraint(verticalConstraint) 

     let widthConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 100) 
     view.addConstraint(widthConstraint) 

     let heightConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 100) 
     view.addConstraint(heightConstraint) 

我的問題是，如何獲取的寬度和高度的限制是充滿設備的屏幕？我必須這樣做編程

Answer 1

使用此約束全屏模式：

let topConst = NSLayoutConstraint(item: self.webView, attribute: NSLayoutAttribute.top, relatedBy: NSLayoutRelation.equal, toItem: self.view, attribute: NSLayoutAttribute.top, multiplier: 1, constant: 0) 
let botConst = NSLayoutConstraint(item: self.webView, attribute: NSLayoutAttribute.bottom, relatedBy: NSLayoutRelation.equal, toItem: self.view, attribute: NSLayoutAttribute.bottom, multiplier: 1, constant: 0) 
let leftConst = NSLayoutConstraint(item: self.webView, attribute: NSLayoutAttribute.leading, relatedBy: NSLayoutRelation.equal, toItem: self.view, attribute: NSLayoutAttribute.leading, multiplier: 1, constant: 0) 
let rigthConst = NSLayoutConstraint(item: self.webView, attribute: NSLayoutAttribute.trailing, relatedBy: NSLayoutRelation.equal, toItem: self.view, attribute: NSLayoutAttribute.trailing, multiplier: 1, constant: 0) 

NSLayoutConstraint.activate([topConst,botConst,leftConst,rigthConst]) 

self.webView.translatesAutoresizingMaskIntoConstraints = false 

的WebView是，我想在全屏視圖。不要忘記在激活約束條件後將translatesAutoresizingMaskIntoConstraints設置爲false。